a contract expires 12 months after it is initially signed). This can be used when two events must occur with a fixed interval between them (e.g. You can specify additional offsets for item-based constraints to add additional time between the affected items. There are a number of different configuration options to choose from when creating a constraint for a particular item in your timeline. Under the heading ‘Date Constraints’, click the add icon ( ) to create a new constraint. You can also create constraints in the Dependencies and Constraints tab in the inspector. Alternatively, you can choose Remove Dependencies from the Item menu to remove all dependencies associated with the selected items. To delete an existing dependency, click on the delete icon ( ) alongside the item in the inspector. Start to Finish: Event B’s end date must be later than or equal to Event A’s start date.Start to Start: Event B’s start date must be later than or equal to Event A’s start date.Finish to Finish: Event B’s end date must be later than or equal to Event A’s end date.Finish to Start: Event B’s start date must be later than or equal to Event A’s end date.This allows you to choose between the following four dependency types: To select a different dependency type, click on the down arrow ( ) next to the dependency. Newly created dependencies will default to the Finish to Start dependency type as this will be appropriate in most circumstances. If more than two events are selected, a chain of dependencies will be created such that the second event is dependent on the first, the third is dependent on the second, and so on. With two events selected, a new dependency will be created so that the later event is Blocked by the earlier event. You can quickly add dependencies between multiple selected events by choosing Make Dependent underneath the Timeline menu.This menu will only be enabled when multiple events are selected. Likewise, to make another item depend on the currently selected item, click on the + icon alongside the Blocks list instead. To make the selected item dependent on another, click on the add icon ( ) alongside the Blocked by list and choose the second item from the ensuing dropdown. To configure dependencies for an item, switch to the Dependencies and Constraints tab in the Inspector, and modify the Blocks and Blocked by lists under the Timeline Dependencies heading. Note that this offers more flexibility than Aeon Timeline version 2.x, where this differentiation between simple dependencies and flexible constraints didn’t exist, and all dependencies implied an exact date (i.e. an offset should be applied to the calculation (e.g.an exact or relational comparison is used (e.g.A > B), or matches only part of a date (e.g. A > 2012), relative to another item (e.g. the comparison is against a fixed date (e.g.the start or end date of the item is affected.With constraints, the user is able to specify combinations of options, including whether: These include constraints that directly affect the allowed timing of items by tying them to a specific date or offset from another event. What are Constraints?Ĭonstraints are a more advanced option that provides more flexibility in specifying time-based constraints for items. For more advanced scenarios, including those that specify an exact timing, you should use Constraints instead. Importantly, dependencies specify an order of events, but they do not specify an exact timing: when Event B is blocked by Event A, we know that B should follow A, but that does not mean that B should immediately follow A. In this scenario, we also say that “Event A” blocks “Event B”, and when you look at the Item Inspector, you will see lists for both Blocks and Blocked by dependencies. We use the terms Blocks and Blocked by to designate the relationship between two dependent events: when “Event B” is blocked by “Event A”, this means that Event B cannot start until Event A has finished (see dependency types below for slight variations on this). Dependencies can also be shown in item cards. the electrical wiring cannot commence until the house is made watertight), but they can be applied to many different scenarios across project management, fiction, and legal industries. This is most commonly associated with Project Management, where such prerequisites are commonplace (e.g. Dependencies and Constraints What Are Dependencies?ĭependencies ensure items in your timeline are placed in a logical and consistent order, by specifying items that rely on other items to be completed.
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